Rotary converter



Dec. 30, 1924 K 1,521,280

R. DE BRUYN ROTARY CONVERTER Filed Feb. 24, 1921 Rd@ Bvurn mmm/(SQA.

Patented Dec. 3), 1924.

NTE) STATES Application filed February 2 To all whom i may concern.'

Be it'known that l, Dn lnui'in a subject of the Kingdom or" Belgium,residing 23, Rue de la Chapelle-Beausairt, Montsur-Marcliienne, Belgium,have invented certain new and useful Improvements in Rotary Converters,ot which the tollowing is a specication.

Rota-ry converters are generally censitered as machines with. constanttension, and in order to vary the ratio between the alternatingelectromotive torce and the continuous eleetroniotive force, it hasalreadj,T been proposed to employ two field systems, lagging 900 onebehind the other, each comprising a shunt winding and a series winding,in. combination with commutation windings.

The main object otx the present invention consists in providing a rotarywith variable tension, ot' the above mentioned type, but comprising asmaller number oit windings then heretofore.

Besides, in rotaryv converters actnalh7 in use, the excitation isgenera-ll)7 varied by incansot separate resistances, and another objectof the invention consists in providing means by which the variable ratiobetween the alternating and the continuous electromotive forces isobtained by a single, combined operation or' the adjusting resist-ences.

ln the annexed drawings:

F ig. l is a diagram of a ield arrangement `according to the inventiong-Fig. 2 is a diagram of an arrangement of two field systen'is-shown forexplaining the operation ofthe machine ot Fic. l;

Fig. 8 is a vectorial represent-ation ot the electroniotive forces andot the fields ott the machine.`

Referring lirst to Fig. 2, in which A and B are the two continuouscurrent brushes, a, Z) and c the brushes for carrying the alternatingcurrent, the two sets ot' iield coils comprise, one the shunt winding D1and the series winding C1, the other the shunt winding D2 and the serieswinding (l2: CZ is a shunt commutation winding, f a series commutationwinding, e an independent source 'feeding windings D1 and D2, and g1,g2, and fil, 7b2, adjusting resistances for the shunt and seriesexcitations respectively.

lt is known that when running idle the fields H1 and H2, due to'windings D1 and D2, are combined in order to give a resulting ield Hinducing in the machine an en, mot-ive 'tort-e which equal to thealternating tension applied.

Between El, and follows:

H2, the relation :is

the maximal tensien` it citations be regulatel tor obtzfrining a teusionE, whi :t the in mal tension is Em; then the vector Fim oiiA the maximaltension will.A be at an angle s ot the brush line. so that cos li" l(xbe the vector representing the field due to the continuous current inthe armature, the field due the alternating current will have a wattcomponent iw directed in opposite sense to vector E, andthe 'eine olwhich is lwzlc cos s.

Said relation results trom the Ytact that the wett power absorbed asalternating current is equal, the losses being excepted., to the powerdelivered as continuous current.

Assuming that the excitations be so adjusted that the machine absorbs nowattless current, the fields induced in thc machine will comprise fielddue to the continuons current, and ield l due to the absorbednlternating current.

'lhe resultant l, olI said Vtield hns a Vvalue LIL sin e, and isdirected at right angles to vector En, ot the induced tension. Y

l'ilhether the converter delivers or absorbs continuous current, saidrese tant is taken trom or added to the ri-sultunt ot the i'ields due tocoils D1` and Thus in order to maintain under load the tensionE,existing initialhY between brushes when running idle, it `is necessariYthat the resultant of the vdelds due to D, and D, he increased orreduced proportionally to vector L. it is for that reason that theninchine, subject matter et the invention, coinlOl CAJI

titl

prises two coils C1 and C2 energized in series by the principal current,and the ainpere-turns of which can be regulated by means of resistances7L, and h2 mounted in shunt.

From the above it will be seen that the resistances must be so adjustedthat D1 be proportional (E) to II cos e DZEH sin e CIEL cos 6:10 sin ecos e CZEIr sin e=Io sin2 e.

Referring now to the arrangement shown in Fig. l, in which thecontinuous current brushes are still designated by A, B, and thealternating brushes by c, b, c, but where, according to the invention,windings D1 and C1, are combined into one single coil F1, and coils D2and C2 are combined into a single coil F 2, situated at O of the irstcoil, both coils being connected with the terminals of a compoundexciter c having a shunt excitation and series excitation j traversed bythe commutation current. The regulation is effected by means ol'l tworesistances K1 and K2 and shunt L.

The machine comprises one line of supplementary brushes A1B, at 90O otthe brush line A B. The tension between the brushes A, and B1 on the onehand, and A and B on the other hand, excites the commutation coils y',and f2, which eliminate the field in the commutation Zones; the windingis maintained for the same purpose as before.

From the above it will be seen that F1=D1+C1EH cos @Ji-Ic sin e cos eF2=D2+C2EH sin e-|-Ic sin2 e or also FlEcos e (H-l-Ic sin e) FzEsin e(Hl-Ic sin e).

The tension c at the compound exciter terminals can be formed of twocomponents such that @EHI KIQ) so that it will only be necessary toadjust resistance 7L so that the component K Ic varies proportionally toIC sin s, and simultaneously the resistances K1 and K2, so that theexcitations Fl and F2 vary respectively as cos e and sin e.

.It is clear that in the arrangement shown in Fig. 2, the handles of thetour resistances may also be mechanically connected, (L) in which casethe resistance C2 will be shunted.

iVhat I claim is:

l. In a rotary converter, the combination with a revolving member havingslip rings, a commutator and brushes on the said commutator, astationary member having a field windinel at right angles from the brushline, and connected with the terminals of a compound exciter, a secondfield Winding arranged coaxially with the brush line, and also connectedwith the terminals of the said compound exciter, means for adjusting theampereturns ot said Iield windings, and means for varying theampereturns of the series excitation of the compound exciter.

2. In a rotary converter, the combination with a rotary member havingslip rings, a commutator and brushes on said commutator, a stationarymember having a eld winding arranged at right angles from the brushline, and connected with the terminals of a compound exciter, a secondfield Winding arranged coaxially with the brush line, and also connectedwith the terminals of the compound exciter, the series excitation of thelatter being fed by the current of the converting machine, and means forvarying the ampereturns of the ield windings and of the series windingof the exciter.

3. In a rotary converter, the combination with a revolving member havingslip rings, a commutator and main brushes on said commutator, astationary member having a tield winding arranged at right angles fromthe brush line, and connected with the terminals oit a compound exciter,a second field winding arranged coaxially with the brush line and alsoconnected with the terminals oi the compound exciter, auxiliary brushessituated at right angles from the main brushes, a commutation winding inshunt on the main brushes and a commutation winding in shunt on theauxiliary brushes.

4. In a rotary converter, the combination with a rotary member havingslip rings, a commutator, and main brushes on said commutator, astationary member having a field winding arranged at right angles fromthe brush line, and connected with the terminals of a compound exciter,a second field winding, arranged coaxially with the brush line, and alsoconnected with the terminals of a compound exciter, auxiliary brushessituated at right angles from the main brushes, a commutation winding inshunt on the main brushes, a commutation winding in shunt on theauxiliary brushes, and a series commutation winding coaxial with themain brushes.

In testimony whereof I have signed my name to this specilication.

REN nn BRU YN.

lVitness:

RENE P. VITHBOLLY.

